Bush opposes the passing of a bill declaring the killings of Armenians a genocide. Relations with Turkey are touchy, and this bill might lead to Turkish incursions in Iraq to deal with Kurdish separatists...they've been threatening to do it for some time. Turkey has made it clear that the passage of this resolution will damage US-Turkish relations considerably. By modern standards I think it was a genocide, but Turkish nationalists fear that Holocaust-style reparations demands will follow in the wake of any official admission that a systematic killing took place. Ultimately I think the possible effects on the Iraq situation are motivating Bush here.